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Ultraslow dielectric relaxation process in supercooled polyhydric alcohols
| Title: | Ultraslow dielectric relaxation process in supercooled polyhydric alcohols |
| Authors: | Yomogida, Yoshiki Browse this author | | Minoguchi, Ayumi Browse this author | | Nozaki, Ryusuke Browse this author →KAKEN DB |
| Issue Date: | Apr-2006 |
| Publisher: | American Physical Society |
| Journal Title: | Physical review E |
| Volume: | 73 |
| Issue: | 4 |
| Start Page: | 041510-1 |
| End Page: | 041510-6 |
| Publisher DOI: | 10.1103/PhysRevE.73.041510 |
| PMID: | 16711812 |
| Abstract: | Complex permittivity was obtained on glycerol, xylitol, sorbitol and sorbitol-xylitol mixtures in the supercooled liquid state in the frequency range between 10 µ Hz and 500 MHz at temperatures near and above the glass transition temperature. For all the materials, a dielectric relaxation process was observed in addition to the well-known structural α and Johari-Goldstein β relaxation process [G. P. Johari and M. Goldstein, J. Chem. Phys. 53, 2372 (1970)]. The relaxation time for the new process is always larger than that for the α process. The relaxation time shows non-Arrhenius temperature dependence with correlation to the behavior of the α process and it depends on the molecular size systematically. The dielectric relaxation strength for the new process shows the effect of thermal history and decreases exponentially with time at a constant temperature. It can be considered that a nonequilibrium dynamics causes the new process. |
| Rights: | Copyright © 2006 American Physical Society |
| Relation: | http://pre.aps.org/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/9101 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 蓬田 美樹
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